Using a mutual bank for home loans?

Currently looking to buy my first home within one of Adelaide's suburbs and looking at giving Beyond Bank a try, specifically their basic variable home loan.Seems quite good with low yearly costs ($132) and a variable rate of 4.64%

Would love to hear from anyone who has dealt with mutual banks before and how their experience was? Doing so research on them now, a big attraction for me is that they're customer owned unlike the big 4 in Australia.